• Bulletin of the Korean Chemical Society
• /
• v.24 no.8
• /
• pp.1102-1106
• /
• 2003

In our previous work we developed the Finite Field method in order to calculate the fifth-order Raman response. The method was applied to calculate various polarization components of the two-dimensional response of liquid $CS_2$. So far, all calculations relied on the dipole-induced dipole. Accurate time-dependent density functional theory calculations have shown that this model has big discrepancies, when molecules are close together as in the liquid. We now report results of investigations on the importance of multipole and electron overlap effects on the polarizability and the fifth-order Raman response. It is shown that these collision effects, especially the induced multipoles, are crucial in the description of the fifth-order response. The impact is found to be especially pronounced for the χ_{mmzzzz}^{(5)}$response that is solely due to interaction induced effects. The calculated response will be compared with various experimental results.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2004.05a
• /
• pp.380-383
• /
• 2004

The coarse and fine aggregates that make up the majority of concrete are resources. But, the raw naturals that make up concrete are our earth's resources and there is not a replenishable stock. Also industrial waste and life waste leaped into a pollution source. Therefore, as construction continue, quarries are exhausted and new sources must be discovered. The purpose of this paper is to investigate an application of recycled coal ash plastics in the construction field. The study examined the physical and mechanical properties of recycled coal ash plastics aggregate. In the results, although the absorption and specific gravity of SLAs increases slightly as the fly ash content increases, the compressive strength and modulus of elastic of concrete made with SLAs remains relatively constant when mortar type and volume fraction are also held constant. These values are always lower than natural-weight aggregate concretes.

• Proceeding of EDISON Challenge
• /
• 2017.03a
• /
• pp.580-584
• /
• 2017

본 논문에서는 얀센 메커니즘을 이용한 4족 보행 로봇의 설계와 라인 추적을 통해 목표지점까지 도달할 수 있도록 하는 센싱에 대해 보인다. 가장 핵심이라고 판단되는 구동부의 최적 설계를 위해 m.Sketch를 이용하여 GAC와 GL를 설정하였고, 최적 설계 후 다리 경량화를 통한 로봇 속도 개선 등의 문제는 차후에 다루기로 한다. 본 논문에서 언급되는 모든 구동부는 이론적 계산을 기초로 하여 CATIA 프로그램을 사용하여 제작되었으며, 과학상자를 이용한 여러 번의 구조변경 실험을 통해 최적의 설계를 찾는 것을 목표로 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.23 no.6
• /
• pp.1425-1432
• /
• 1998

The propagation properties of Gaussian pulse signals on the microstrip line are investigated by the Kirschning & Jansen's approximated equation to meet the frequency range of a pulse, accuracy, and geometrical requiremtns of the microstrip line. The dispersion of pulse signals is analyzed regarding to the relative permittivity .epsilon.$_{r}$, substrate height h and strip width w of the microstrip line. To verify theoretical results, several samples of 50.OMEGA. microstrip lines are fabricated. And the characteristics of pulse propagation along these lines are simple measured using VNA(Vector Network Analyzer) with time-domain analysis function. A fairly good agreement has been found between the measured pulse waveforms and computer simulations.

• Proceeding of EDISON Challenge
• /
• 2016.03a
• /
• pp.485-488
• /
• 2016

In this paper, the mechanism that works by using eight legs is proposed. The walker has eleven bars instead of wheel, it shows a Biologically-inspired movement method. their driving appearance is very similar with creature which walks by its legs. For example, a crab and spider so on. This mechanism has simple style that can expand its size and attach more legs beside. For the competition regulation, we had to find working parts in the science box and some other things that can be found easily in the surroundings only usual material. The mission is making a machine that is enable to pass obstacle and to walk well. This paper followed the rules by regulation.

• Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
• /
• 2001.06a
• /
• pp.3122-3122
• /
• 2001

Documented quality control plays a vital role I the production of technical “Depth filter” sheets used in industries such as Beverage and pharmaceutical. Depth filter sheets which can be up to several millimeters thick are stacker in plate and frame filter systems. They are the core of stainless steel filter systems which can be up to several meters high. FT-NIR Spectroscopy has many potential applications in the whole production line of filter sheets. Raw materials such as different types of cellulose pads, white powdery fillers (e.g. Kieelgur, Perlite) or liquid chemicals such as wet-strength agents we, with the help of NIR, easy to identify. NIR can also determine physical parameters such as particle size, essential for the filtration behavior. FT-NIR can be used for the quality parameters of the final product. Moisture and permeability can be determined, and with the help of the speed of this NIR method it is possible to correct possible faults quickly in the production process. Waste production can be minimized which is good for both the product profitability and the environment. Further tests have shown that it is also possible to use NIR on-line in the production area, to check the concentrations and the homogeneity of the paper suspension consisting of cellulose fibres, fillers and additives.

• Proceedings of the Korean Society of Applied Pharmacology
• /
• 1993.04a
• /
• pp.165-165
• /
• 1993

목적:지금까지 Risperidone의 치료 효능과 안전성에 대한 연구들이 모두 만성 정신분열병 환자들만을 대상으로 이루어졌고, 효율적인 약물 요법의 중요한 지침이 되는 유효치료용량(effective therapeutic dosage)에 대한 연구가 이루어지지 않고 있는 바, 본 연구에서는 초발인 급성 정신분열병 환자들을 대상으로 첫째, Risperidone의 항정신병 효과(antipsychotic effect)와 추체외로계증상(extrapyramidal symptoms)을 평가하고 둘째, Risperidone의 항정신병 효과와 혈장 Risperidone 및 9-hydroxyrisperidone 농도와의 상관관계를 분석하여 유효혈장농도(therapeutic dose range)와 유효치료용량(effective therapeutic dosage)의 존재 여부를 검토코자 한다. 방법: DSM-III-R 진단기준(APA 1987)예 의해 정신분열병형 장애로 진단된 환자 11명(남자 5, 여자 6)을 대상으로 Risperidone을 이중맹검법(double blind design)으로 6주간 투약하였다. 정신병리의 평가는 PANSS(Kay 1988)를 이용하였고 추체외로계 부작용의 평가는 ESRS(Chouinard 1980)를 이용하였다. 혈장 Risperidone 농도와 혈장 9-hydroxyrisperidone 농도는 Jansen사의 Radioimmunoassay Kit를 이용하여 3회 측정하였다. 결과: PANSS 점수는 Risperidone 투여 후 1주째부터 통계적으로 유의하게 감소하였다. Parkinsonism과 dyskinesa에 대한 physician's examination 점수는 전체 연구 기간 동안 유의한 변화를 보이지 않았다. Dystonia에 대한 physician's examination 점수는 Risperidone 투여 후 1주째에는 평균 5.96점으로 높았으나 2주째부터 통계적으로 유의하게 감소되어 6주째에는 유지되었다. 혈장 Risperidone 농도와 혈장 9-hydroxyrisperidone 농도는 PANSS 점수와 유의한 상관관계를 보이지 않았다.

• Applied Microscopy
• /
• v.33 no.2
• /
• pp.93-104
• /
• 2003

Since the Ptolemaeos' discovery that glass has magnifying power, human desire to see the unseen with naked eyes has lead to the inventions of a series of microscopes. Since the Janssen's first compound microscope in 1595, through the Abbe's non-aberration microscopy, various microscopes using different principles are now being used in various biomedical researches. The discovery of electron by Thompson in 1897 has lead to the first invention of microscope using electron as an illumination source, the electron microscope, in 1931. Now we can see the objects as close as 0.05 nm using 1 MV FE-TEM constructed in 2000. In this review, the authors reviewed the predecessors efforts to develop better microscopes.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.1140-1143
• /
• 2009

Organic Vapor Phase Deposition (OVPD) equipment enables the accurate and simultaneous control of deposition rates of multiple materials as well as their homogenous mixing in the gas phase. Graded or even cross-faded layers by varying carrier gas flow are options to improve OLED performances. As example, we will show how the efficacies of standard red phosphorescent OLEDs with sharp interfaces can be increased from 18.8 cd/A and 14.1 lm/W (1,000 cd/$m^2$) to 36.5 cd/A (+94 %, 18 % EQE) and 33.7 lm/W (+139 %) by the introduction of cross-fading, which is a controlled composition variation in the organic film.

• Journal of Smart Tourism
• /
• v.1 no.1
• /
• pp.53-64
• /
• 2021

Upselling is often a critical factor in revenue generation for businesses in the tourism and travel industry. Utilizing passenger data from a major international airline company, we develop the PAX (Passenger, Airline, eXternal) model to predict passengers that are most likely to accept an upgrade offer from economy to premium. Formulating the problem as an extremely unbalanced, cost-sensitive, supervised binary classification, we predict if a customer will take an upgrade offer. We use a feature vector created from the historical data of 3 million passenger records from 2017 to 2019, in which passengers received approximately 635,000 upgrade offers worth more than $422,000,000 U.S. dollars. The model has an F1-score of 0.75, outperforming the airline's current rule-based approach. Findings have several practical applications, including identifying promising customers for upselling and minimizing the number of indiscriminate emails sent to customers. Accurately identifying the few customers who will react positively to upgrade offers is of paramount importance given the airline 'industry's razor-thin margins. Research results have significant real-world impacts because there is the potential to improve targeted upselling to customers in the airline and related industries.